package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.result.Result;
import com.sky.service.impl.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.utils.JwtUtil;
import com.sky.vo.UserLoginVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    //定义一个常量
    public final static  String URL="https://api.weixin.qq.com/sns/jscode2session";
    /**
     * C端用户登录
     * @param dto
     * @return
     */
    @Override
    public Result<UserLoginVO> login(UserLoginDTO dto) {
        //1.调用微信登录凭证校验接口
        //1.2 封装请求参数
        Map<String, String> paramMap=new HashMap<>();
        paramMap.put("appid",weChatProperties.getAppid());
        paramMap.put("secret",weChatProperties.getSecret());
        paramMap.put("js_code",dto.getCode());
        paramMap.put("grant_type","authorization_code");
        //1.1调用接口
        String body = HttpClientUtil.doGet(URL, paramMap);
        //1.3解析body字符串，然后获取openId
        Map map = JSON.parseObject(body, Map.class);
        String openid = (String) map.get("openid");
        log.info("微信用户返回的openid为:{}",openid);
        //1.4 判断openid是否为空
        if(openid==null){
            return Result.error(MessageConstant.LOGIN_FAILED);
        }
        //2.判断当前用户是否是新用户，如果是则注册
        //2.1 根据openid查询user表
        User user = userMapper.getByOpenid(openid);
        if(user==null){
            //表示为空，则注册
            user= User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        //3.封装数据并返回数据
        String token = JwtUtil.getToken(user.getId());
        UserLoginVO vo= UserLoginVO.builder()
                .id(user.getId())
                .openid(openid)
                .token(token)
                .build();

        return Result.success(vo);
    }
}
